Update .travis.yml

.travis.yml

@@ -2,4 +2,4 @@ language: java
 jdk: oraclejdk8
 sudo: false
 install: true # The install step runs before script step, and with Maven you don't usually need the install step, at least I personally haven't ever found it useful — Maven will download dependencies on script step anyway
-script: mvn -f pom_travis.xml clean verify
+script: mvn -f pom_travis.xml clean package